/*
 * Copyright 2012 Sebastian Annies, Hamburg
 *
 * Licensed under the Apache License, Version 2.0 (the License);
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an AS IS BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.coremedia.iso;

import com.googlecode.mp4parser.AbstractBox;
import com.coremedia.iso.boxes.Box;

import java.io.BufferedInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.lang.reflect.Constructor;
import java.lang.reflect.InvocationTargetException;
import java.net.URL;
import java.util.Enumeration;
import java.util.Properties;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

/**
 * A Property file based BoxFactory
 */
public class PropertyBoxParserImpl extends AbstractBoxParser {
  Properties mapping;

  public PropertyBoxParserImpl(String... customProperties) {
    InputStream is = new BufferedInputStream(getClass().getResourceAsStream("/isoparser-default.properties"));
    try {
      mapping = new Properties();
      try {
        mapping.load(is);
        Enumeration<URL> enumeration = Thread.currentThread().getContextClassLoader().getResources("isoparser-custom.properties");

        while (enumeration.hasMoreElements()) {
          URL url = enumeration.nextElement();
          InputStream customIS = new BufferedInputStream(url.openStream());
          try {
            mapping.load(customIS);
          } finally {
            customIS.close();
          }
        }
        for (String customProperty : customProperties) {
          mapping.load(new BufferedInputStream(getClass().getResourceAsStream(customProperty)));
        }
      } catch (IOException e) {
        throw new RuntimeException(e);
      }
    } finally {
      try {
        is.close();
      } catch (IOException e) {
        e.printStackTrace();
        // ignore - I can't help
      }
    }
  }

  public PropertyBoxParserImpl(Properties mapping) {
    this.mapping = mapping;
  }

  Pattern p = Pattern.compile("(.*)\\((.*?)\\)");

  @SuppressWarnings("unchecked")
  public Class<? extends Box> getClassForFourCc(String type, byte[] userType, String parent) {
    FourCcToBox fourCcToBox = new FourCcToBox(type, userType, parent).invoke();
    try {
      return (Class<? extends Box>) Class.forName(fourCcToBox.clazzName);
    } catch (ClassNotFoundException e) {
      throw new RuntimeException(e);
    }
  }

  @Override
  public Box createBox(String type, byte[] userType, String parent) {

    FourCcToBox fourCcToBox = new FourCcToBox(type, userType, parent).invoke();
    String[] param = fourCcToBox.getParam();
    String clazzName = fourCcToBox.getClazzName();
    try {
      if (param[0].trim().length() == 0) {
        param = new String[]{};
      }
      Class clazz = Class.forName(clazzName);

      Class[] constructorArgsClazz = new Class[param.length];
      Object[] constructorArgs = new Object[param.length];
      for (int i = 0; i < param.length; i++) {

        if ("userType".equals(param[i])) {
          constructorArgs[i] = userType;
          constructorArgsClazz[i] = byte[].class;
        } else if ("type".equals(param[i])) {
          constructorArgs[i] = type;
          constructorArgsClazz[i] = String.class;
        } else if ("parent".equals(param[i])) {
          constructorArgs[i] = parent;
          constructorArgsClazz[i] = String.class;
        } else {
          throw new InternalError("No such param: " + param[i]);
        }


      }
      Constructor<AbstractBox> constructorObject;
      try {
        if (param.length > 0) {
          constructorObject = clazz.getConstructor(constructorArgsClazz);
        } else {
          constructorObject = clazz.getConstructor();
        }

        return constructorObject.newInstance(constructorArgs);
      } catch (NoSuchMethodException e) {
        throw new RuntimeException(e);
      } catch (InvocationTargetException e) {
        throw new RuntimeException(e);
      } catch (InstantiationException e) {
        throw new RuntimeException(e);
      } catch (IllegalAccessException e) {
        throw new RuntimeException(e);
      }


    } catch (ClassNotFoundException e) {
      throw new RuntimeException(e);
    }
  }

  private class FourCcToBox {
    private String type;
    private byte[] userType;
    private String parent;
    private String clazzName;
    private String[] param;

    public FourCcToBox(String type, byte[] userType, String parent) {
      this.type = type;
      this.parent = parent;
      this.userType = userType;
    }

    public String getClazzName() {
      return clazzName;
    }

    public String[] getParam() {
      return param;
    }

    public FourCcToBox invoke() {
      String constructor;
      if (userType != null) {
        if (!"uuid".equals((type))) {
          throw new RuntimeException("we have a userType but no uuid box type. Something's wrong");
        }
        constructor = mapping.getProperty((parent) + "-uuid[" + Hex.encodeHex(userType).toUpperCase() + "]");
        if (constructor == null) {
          constructor = mapping.getProperty("uuid[" + Hex.encodeHex(userType).toUpperCase() + "]");
        }
        if (constructor == null) {
          constructor = mapping.getProperty("uuid");
        }
      } else {
        constructor = mapping.getProperty((parent) + "-" + (type));
        if (constructor == null) {
          constructor = mapping.getProperty((type));
        }
      }
      if (constructor == null) {
        constructor = mapping.getProperty("default");
      }
      if (constructor == null) {
        throw new RuntimeException("No box object found for " + type);
      }
      Matcher m = p.matcher(constructor);
      boolean matches = m.matches();
      if (!matches) {
        throw new RuntimeException("Cannot work with that constructor: " + constructor);
      }
      clazzName = m.group(1);
      param = m.group(2).split(",");
      return this;
    }
  }
}
